LM324 Equivalent Quad Op-Amp ICs

LM3900, LMC660, LM339, LT014, LM2900, LM324A, LM324E, LM324-N, LM324W

Brief Description

LM324 is a Quad op-amp IC integrated with four op-amps powered by a common power supply. The differential input voltage range can be equal to that of power supply voltage. The default input offset voltage is very low which is of magnitude 2mV. The operating temperature ranges from 0˚C to 70˚C at ambient whereas the maximum junction temperature can be upto 150˚C. Generally, op-amps can perform mathematical operations.

LM324 Explanation with example

Consider, an motor running with a variable load. As the load increases the current increases which in turn increases the temperature of the motor. So, our job is to shut down the system if the temperature increases beyond rated. This is the place where op amp operates as a positive comparator. Here a thermistor does the job whose resistance varies with temperature.

Below will be a simple circuit connection to sense temperature and control a system.